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CHAPTER 3 HELLO WORLD! USING DDT
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Figure 3 3. Click Yes to add the requirements to the new robustness diagram. The add-in also creates a new note that is hot-linked to the use case text see Figure 3 4.
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Figure 3 4. The blank robustness diagram, with the use case text and requirements automatically added
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CHAPTER 3 HELLO WORLD! USING DDT
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Having the requirements on the robustness diagram helps to make sure you haven t forgotten any requirements as you analyze the use case. Next you ll want to draw the robustness diagram (see Figure 3 5). This is essentially a picture of the use case. Starting from the top left of the diagram, you should be able to trace the use case text along the diagram. Creating the robustness diagram is known as conceptual design it s an early sanity check to ensure that the use case is fit to drive a detailed design, and tests, of course. Don t worry about the details for now. We ll cover robustness analysis in 6, but for a really detailed illustration of the technique, we can recommend our other book, Use Case Driven Object Modeling with UML: Theory and Practice.
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Figure 3 5. The completed robustness diagram. Whoops, why isn t that lock account requirement discussed in the use case
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CHAPTER 3 HELLO WORLD! USING DDT
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A couple of questions arose during robustness analysis: Isn t the first alternate course, Improperly formatted password, better suited to a Create New Account use case, where checks would be made on the new password for such things as minimum size and mix of upper/lower case letters The idea is that if the same initial check is made when the user is logging in, then it saves a database lookup if the password is obviously invalid as long as we generate the same invalid login credentials message as opposed to a different one. There s a requirement Lock account after 3 failed login attempts, but why isn t this also in the use case text (It should be an alternate course.) That one s easy: we forgot to add it in, but on drawing the robustness diagram, because the requirement is right there on the diagram, it stood out like Che Guevara at a Canary Wharf wine bar.
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These kinds of reality checks questions arising about the requirements, prompting a chat with the customer/project stakeholders, or gaps highlighted in the use case text happen time and time again during robustness analysis. The added benefit for DDTers is that we won t redundantly generate unit tests for the password format requirement in the Create a New Password story, as might have happened if two pairs of TDDers were each given one of the stories. By analyzing your use case using robustness analysis, you ve added a lot of information to the model that can be used to drive the testing of the application. To begin with, the add-in can automatically generate test cases for each controller on the robustness diagram which brings us to the next step.
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Step 2: Create Controller Test Cases
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On the robustness diagram (see Figure 3 5), the circles with an arrow at the top are controllers. These represent the verbs, or actions something that the system does in response to a user s impetus. For example, Lock account, Validate password syntax, etc. are all actions, so they are represented as controllers. If you think about it, these are the real processing points in the system being designed, so these are the hot spots in the system that you ll want to cover with automated tests. It s worth emphasizing that, because if you understand this point then you re easily within reach of fully appreciating and understanding the test smarter philosophy that underpins DDT:
The controllers represent the system behavior organized into convenient bite-size pieces that usually represent a small group of methods working together to perform a logical function. They re the moving parts in the machine, so they are the critical areas that most need to be tested. As it turns out, robustness analysis is a straightforward, efficient method of discovering these critical areas.
Controllers are also known as logical software functions: when you identify controllers, you re specifying the system behavior. If you think of unit tests as atomic, you can think of controller tests as molecular, as in Figure 3 6. 2
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